I don't mind people paying to power level their characters, and 30 million is probably a pretty cheap fee for that service.
Under certain circumstances it can makes sense. For example I have a level 50 grav/kin controller as my main. After checking the forums for some for build advice, I wanted to try a grav/storm controller and since I have a 50 storm defender I'm familiar with both power sets. So if PL'ed I could still hit the ground running at 50.
However I wouldn't ever do that because I'm the kind of player that enjoys the ride. With so many AT's and power combo's teaming is always interesting and different at any level. Sure you may not have access to all your powers, but even that can be fun, since you have to effectively use the powers you have. Compared to when the game launched, it's really easy to get to 50 now. By running DFB, DIB, SBB, TF's, MSR, and ITF you will hit 50 pretty quickly.
If you want to check what you character will be like at 50, you can copy any of you current characters to the test server with the Beta Account Center link. Once copied use the /gmotd to see how to make them 50 and if you use the Freebies Popmenu (see beta forums) you can quickly slot any of the enhancements you want.